Yes, its true, because many people have become rich due to bitcoin. They have done investments and have just waited for several years. But now it's not too late. Bitcoin is always increasing and your can get a good profit.
Yes, I agree with you, usually, you can get a good profit in bitcoin. Because bitcoin today is very interesting, imagine that an ordinary people turn into a millionaire. With bitcoin price bubbling last year, I'm sure 2018 is a great year for bitcoin.